scftorture: Count single_rpc offline failures in statistics outputgrafted

scf_torture_stats_print() aggregates each invoker thread's counters
into a local scf_statistics structure before printing, but the
n_single_rpc_ofl field is missing from the aggregation loop.  As a
result, the "single_rpc_ofl" value printed in the statistics line is
always zero, even when smp_call_function_single() invocations for the
RPC test have failed due to offline CPUs and been counted by the
invoker threads.

Add the missing accumulation so that the printed value reflects the
actual counts.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>

1 files changed, 79 insertions, 0 deletions

diff --git a/net/sched/em_nbyte.c b/net/sched/em_nbyte.c
new file mode 100644
index 000000000..c65ffa5ff
--- /dev/null
+++ b/net/sched/em_nbyte.c
@@ -0,0 +1,79 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * net/sched/em_nbyte.c	N-Byte ematch
+ *
+ * Authors:	Thomas Graf <tgraf@suug.ch>
+ */
+
+#include <linux/gfp.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+#include <linux/skbuff.h>
+#include <linux/tc_ematch/tc_em_nbyte.h>
+#include <net/pkt_cls.h>
+
+struct nbyte_data {
+	struct tcf_em_nbyte	hdr;
+	char			pattern[];
+};
+
+static int em_nbyte_change(struct net *net, void *data, int data_len,
+			   struct tcf_ematch *em)
+{
+	struct tcf_em_nbyte *nbyte = data;
+
+	if (data_len < sizeof(*nbyte) ||
+	    data_len < (sizeof(*nbyte) + nbyte->len))
+		return -EINVAL;
+
+	em->datalen = sizeof(*nbyte) + nbyte->len;
+	em->data = (unsigned long)kmemdup(data, em->datalen, GFP_KERNEL);
+	if (em->data == 0UL)
+		return -ENOMEM;
+
+	return 0;
+}
+
+static int em_nbyte_match(struct sk_buff *skb, struct tcf_ematch *em,
+			  struct tcf_pkt_info *info)
+{
+	struct nbyte_data *nbyte = (struct nbyte_data *) em->data;
+	unsigned char *ptr = tcf_get_base_ptr(skb, nbyte->hdr.layer);
+
+	if (!ptr)
+		return 0;
+	ptr += nbyte->hdr.off;
+
+	if (!tcf_valid_offset(skb, ptr, nbyte->hdr.len))
+		return 0;
+
+	return !memcmp(ptr, nbyte->pattern, nbyte->hdr.len);
+}
+
+static struct tcf_ematch_ops em_nbyte_ops = {
+	.kind	  = TCF_EM_NBYTE,
+	.change	  = em_nbyte_change,
+	.match	  = em_nbyte_match,
+	.owner	  = THIS_MODULE,
+	.link	  = LIST_HEAD_INIT(em_nbyte_ops.link)
+};
+
+static int __init init_em_nbyte(void)
+{
+	return tcf_em_register(&em_nbyte_ops);
+}
+
+static void __exit exit_em_nbyte(void)
+{
+	tcf_em_unregister(&em_nbyte_ops);
+}
+
+MODULE_DESCRIPTION("ematch classifier for arbitrary skb multi-bytes");
+MODULE_LICENSE("GPL");
+
+module_init(init_em_nbyte);
+module_exit(exit_em_nbyte);
+
+MODULE_ALIAS_TCF_EMATCH(TCF_EM_NBYTE);